yes, the heritage motor centre have a lot of important minis but unfortunately they only have room for a few of them.
they have a fascinating car called the minki 2 that is longer and wider than a standard mini but otherwise looks the same, it's fitted with the K series engine.
i spoke to the museum curator about it and he assured me that it was only ever a design exercise and had no real chance of going into production, shame really.
I'll post some pics in a bit, when I've found them
they also have the issigonis lightweight special, which was on display last time i was there
a good place to visit, and they do have their own mini show once a year which is now sponsored by mini world